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Snowbum

Snowbum has a tutorial on drilling mufflers for a better sound, and this "deep drill" is part of it. Can't find the link, but if you Google Snowbum, you'll easily find all his detailed articles.

Sadly, if you require pictures to understand instructions (vice words), Snowbum is not the guy for you. Fortunately, he uses many nice bright colors, sorta like Crayons, which helps when reading his long and quite specific instructions. He usually repeats the IMPORTANT stuff at least twice, a feature of his work that I appreciate.

Being a "non-trained" wrench, I read EVERYTHING I can get my hands on before I even think of doing a new job, but that's a personal thing. What I do next is READ EVERYTHING again. Then, after that, especially if I haven't done the job before -- I READ EVERYTHING again, and I'm not kidding. Yes, I'm old, but you may be surprised at all the details that you missed the on the first (or even second) reading. When I follow this discipline, I usually don't have parts left over after re-assembly -- and I take that for a good sign.

Quickseat. . .

I noted that on the "other thread" that you apparently gave up on the Quickseat. I talked to a couple of mechanic friends, but they didn't know anything about it. Website wasn't much help.

Following your investigation, is it not worthy of consideration, or at least not worth $20? Possible damage to the 247? If you feel like reporting, let fly. Enjoying this thread, and I hope you keep it up.

Base Sealant. . .

The latest info from Oak is to use Loctite 510 Sealant. Everybody has their favorite, and many gurus probably still use Hylomar, which probably works just fine if properly applied. There is a LOT of "old" information out there, and Hylomar has been around a long time, which is one reason you see it recommended in so many places.

You probably won't find this product on a shelf. I ordered mine through a local Fastenal store, and it ran about $30 for enough to do many, many bikes IF it doesn't dry out once opened, as with Dreibond and probably others. There are less-expensive choices out there in your local auto supply store, and I know several excellent mechanics who swear by other products that cost under $10 a tube.

I'm not an expert on any of this stuff, by any means, but - like you - I never rush through a job, and I read everything I can get my eyes on.

Base Sealant (2)...

Tom Cutter just gave a nice treatise on gaskets and sealants. In it he stated the following:

------------------------------

BMW original recommendation was Hylomar SQ-32L Sealing compound.

Other sealants used by mechanics include:
- gray ThreeBond Liquid Gasket 1194 sealant
- other names for this include YamaBond 4 from Yamaha
- Suzuki offers the ThreeBond product in BLACK, under their "Sealant 1207B"
label
- Tom uses the Suzuzi 1207B on bikes with black-painted cylinders, and the ThreeBond 1194 for aluminum cylinders

Thanx for the info. Got too many tubes of stuff around here. Need a fresh tube of the latest stuff. Went to bank, got four dollars, bought a can of rustoleum high temp paint, got out broom, and they're all done up fresh black, which will probably wear off in about one summer.

I used the rustoleum high heat spray on my valve covers and it held up tremendously, and that's without even prepping it properly. Once I'm ready to put my high compression pistons in I'll likely use the same spray on the cylinders.

Also, I sent you a PM but for some reason this forum won't let me send any out. Did you have to grind your valve pockets with the 336 cam using the 9.5:1 pistons? I've heard people say they've had to with smaller displacement engines and heard some people just put in the cam and go. I have the BMW TSB and they are sort of vague whether or not you have to insisting on testing for clearances on installation. I'm so anal I'm going to check all clearances when I finally decide to put the bike down for more than a few days at a time to install this stuff, but just want to know what your experiences with the cam were. The cam, pistons, cylinders, and dell'ortos are all on my shelf ready to go, but I just did the top end last year and have the bike tuned to perfection so I'm not really in any rush to take everything apart again

Here's the standard bore, left, with the first over, intake pockets. That's what I got when bought new pistons, a bigger pocket! And I didn't even know it at the time! Someone was looking out for 8ninety8. These are both 9.5 CR.

I have 2nd oversize and they look deep like the one on the right, maybe a little deeper even (but nothing like the stock one on the left). mine are also going into a 900. I don't have the installation sheet in front of me and it doesn't look like it's available online anymore but there is definitely a higher lift with the 336. I'll be measuring and measuring for sure once I finally decide to put the bike down (I ride through the winter so no downtime there), just wanted to see what your experiences were

I'll give credit to Oak for this. I received his version on an email a number of years ago when he was discussing it on the Airhead list. I requested his figure and he sent me one. Rather than just straight publish his work, I transformed it a bit to create my version. Still, it is Oak's knowledge that is in this figure.

Very Nice. . .

These choke assemblies are SO cool, aren't they? First time I had one apart, I found it so appealing that BMW would put all these wonderful parts into a choke assembly. . .many "simpler" designs are probably out there - like running a naked cable over a hemisphere, but that wouldn't be The BMW Way, and hurrah.

Another Old Beauty. . .

Very, very nicely done, 898, and your craftsmanship shows at every step of the process.

Any post-mortem on the weeping cylinder base? From seeing your previous work, I'm certain that you cut NO corners on the job, so this is a mite worrisome. I should add, I wouldn't obsess over a little oil 'patina' at the base and I'm about as "anal" as it comes. To me, it wouldn't be worth it to do it all over again right away, and especially NOT during riding season, but I'm sure others would disagree. Hey, this is why we always carry a rag with us, right?

I have a specific interest, having just received new Siebenrock cylinders/pistons/rebuilt heads for a '78 R100RS (MS) back from Ted Porter, and am about to use the Loctite at the cylinder/engine case interface. . .

Thanks for all the great pictures along the way. Lunacy loves company.